Spacer for electrical winding coils



Dec. 5, 1933. P A. GILBERT 1,938,421

SPACER FOR ELECTRICAL WINDING COILS Filed March 25. 1932 Inventor:Phillip Acilbert,

H i s Attorney.

Patented ec. 5, 1933 ,il 'UNITED ,STATES SPACER ron ELECTRICAL WINDINGcolLs Phillip A. Gilbert, Dalton, Mass., assignor o General ElectricCompany, a corporation of New York Application March 23, 1932. SerialNo.r 600,659

2 Claims.

My invention relates to spacers for electrical winding coils such as areoften used in transformers and reactors. A winding for electricalapparatus of this character is often inthe form 15j of a stack ofannular or disk coils which are separated by radial spacing strips toprovide spaces or ducts between the coils for the circulation of acooling and insulating fluid such as air or specially prepared oil. Thegeneral objectr of the present invention is to provide an improved coilspacer for disk coils.

Further objects and advantages of the invention will appear from thefollowing description taken in connection with the accompanying drawingin which Fig. 1 shows*y a transformer with disk coils separated byspacers constructed Vand arranged in accordance with the invention; Fig.2 is a sectional view 'on the line` 2-2 of Fig. 1; and Figs. 3, 4 and 5are explanatory perspective detail views of different forms of spacersconstructed in accordance with the invention.

Like reference characters" indicate similar parts in the different guresof the drawing.

Sb" The transformer shown in Figs. 1 and 2 includes a magnetic core 10with windings 11 and 12 formed of stacks of disk coils 13. These coils13 are arranged in pairs, the two coils of each pair being separatedfrom each other by an an- ?:30' nular sheet 14 of insulating material.VAdjacent pairs of coils 13 are separated by radial spacers 15 which arespaced apart to provide ducts 16 through which a cooling and insulatinguid may flow to absorb and'carry away heat from .3'5' vthe coils 13.

The magnetic core 10 has two winding legs 17 which are surrounded byinsulating` cylinders 18. The two coil stacks formedby the coils 13surround the cylinders 18, the inner edges ofthe coils 13 being spacedfrom the cylinders 18 by spacing strips 19 extending parallel to theaxis of the cylinders and interlocked With the inner ends of the radialspacers 15 to hold these radial spacers in place. An insulating andcooling uid in which the transformer may be immersed may thus ow betweenthe inner edges of the coils 13 and the cylinder 18, as well as throughthe ducts 16 between those'coils which kare spaced apart by the radialspacers 15. I Y

Each of the spacing strips 19 includes a channel 20 formed of fibrousinsulating material such as pressboard, the longitudinal edges 21 of thechannel being bent outwardly parallel to the plane of the base of thechannel. The

radial spacers 15 are formed of flat strips 22 of insulating material,any desired number of these strips being superposed if a single strip isnot thick enough for the required spacing between the coils 13. Theinner ends of the radial strips 22 are bifurcated to receive the spacingstrips 19, the two spaced sides 23 of these bifurcated ends ttingagainst the sides of the channel 20 to prevent them from spreading.Notches 24 are provided at the bases of the inner edges of the sides 23to engage the outwardly turned edges 21 of the strips 19 and thus lockthe radial spacers 15 to the spacing strips 19. The spacing strips 19also include llers 25 in the channels 20 to hold the sides of thechannels apart with their outwardly turned edges 21 securely engaged inthe notches 24 of the radial spacer strips 22. The fillers 25 are shownin Figs. 3 and 4 as narrow strips of insulating material extendingbetween the sides of the channel 20. In Fig. 5, the ller 25 is shown asa channel 75 with its base across the open side of the channel 20. Otherforms of ,ller may, yof course, be used if desired. Thechannel 20 may beformed of a single thickness of insulating material, as shown in Figs. 3and 5, or of more than one so thickness, as shown in Fig. 4. .The radialstrips 22 are easily assembled on the strips 19 by slipping the innerbifurcated ends of the strips 22 onto the strips 19v from one end withthe outwardly turned edges 21 of the channelsv 20 in 85 the notches 24of the strips 22.

The invention provides a rsimple and securely interlocked coil spacerconstruction and one which is inexpensive because it may be formedentirely by inexpensive sheet material such as common pressboard.

The invention has been explained by describing and illustrating severalforms thereof, but it will be obvious that changes may be made withoutdeparting from the spirit of the in,- vention and the scope of theappended claims.

What I claim as new and desire to secure by Letters Patent of the UnitedStates is: Y

1.,The combination with a spacer to extend radially between spaced diskcoils of ran electrical winding, said spacer having ka bifurcated end,of a channel formed of iibroussheet matey rial and extending through thebifurcated end of said spacer, the two sides of the bifurcated end. ofsaid spacer fitting against the sides of said channel and having notchesin their inner edges, and the longitudinal edges of said fibrous channelbeing bent outwardly into said notches.

2. 'I'he combination with a spacer to extend radially between spaceddisk coils of an elec- 2 1,938,421 n edges, and the longitudinal edgesof said fibrous trical Winding, said spacer having a bifurcated end, 0I"a channel formed of fibrous sheet material and extending through thebifurcated end of said spacer, the two sides of the bifurcated end ofsaid spacer tting against the sides of said channel and having notchesin their inner sides apart.

PHILLIP A. GILBERT.

